<s>
Multiple	O
Elevation	O
Scan	O
Option	O
for	O
Supplemental	B-Algorithm
Adaptive	I-Algorithm
Intra-Volume	I-Algorithm
Low-Level	I-Algorithm
Scan	I-Algorithm
(	O
abbreviated	O
MESO-SAILS	B-Algorithm
)	O
,	O
is	O
a	O
dynamic	O
scanning	O
option	O
for	O
the	O
WSR-88D	B-Algorithm
,	O
controllable	O
by	O
the	O
operator	O
of	O
the	O
radar	O
,	O
when	O
in	O
VCP	O
mode	O
12	O
and	O
212	O
,	O
and	O
additionally	O
35	O
and	O
215	O
with	O
the	O
Build	O
18	O
update	O
scheduled	O
for	O
October	O
2017	O
.	O
</s>
<s>
WSR-88D	B-Algorithm
radars	O
scan	O
a	O
number	O
of	O
elevation	O
angles	O
to	O
scan	O
the	O
atmosphere	O
around	O
the	O
site	O
.	O
</s>
<s>
Data	O
at	O
that	O
level	O
can	O
be	O
crucial	O
in	O
summer	O
thunderstorm	O
situations	O
when	O
Doppler	O
patterns	O
for	O
rotations	O
and	O
windshifts	O
,	O
as	O
well	O
as	O
dual	O
polarized	O
information	O
,	O
are	O
indicative	O
of	O
severe	O
weather	O
like	O
tornadoes	B-Language
.	O
</s>
<s>
The	O
first	O
step	O
of	O
this	O
program	O
is	O
SAILS	B-Algorithm
(	O
Supplemental	B-Algorithm
Adaptive	I-Algorithm
Intra-Volume	I-Algorithm
Low-Level	I-Algorithm
Scan	I-Algorithm
)	O
which	O
inserts	O
an	O
extra	O
scan	O
of	O
the	O
elevation	O
defined	O
in	O
the	O
VCP	O
definition	O
(	O
normally	O
0.5	O
°	O
)	O
.	O
</s>
<s>
To	O
increase	O
the	O
number	O
of	O
low-level	O
scans	O
,	O
one	O
can	O
redo	O
the	O
same	O
process	O
as	O
SAILS	B-Algorithm
many	O
times	O
:	O
MESO-SAILS	B-Algorithm
(	O
Multiple	O
Elevation	O
Scan	O
Option	O
for	O
SAILS	B-Algorithm
)	O
.	O
</s>
<s>
During	O
the	O
summer	O
of	O
2013	O
,	O
the	O
Radar	O
Operations	O
Center	O
,	O
in	O
order	O
to	O
facilitate	O
"	O
proof	O
of	O
concept	O
"	O
testing	O
of	O
MESO-SAILS	B-Algorithm
,	O
defined	O
two	O
VCPs	O
that	O
were	O
based	O
on	O
VCP-12	O
that	O
included	O
hardcoded	O
additional	O
low-level	O
split-cut	O
scans	O
.	O
</s>
<s>
MESO-SAILS	B-Algorithm
was	O
thus	O
deployed	O
with	O
Build	O
14	O
update	O
in	O
the	O
spring	O
of	O
2014	O
and	O
is	O
still	O
in	O
operations	O
when	O
needed	O
.	O
</s>
<s>
The	O
operator	O
can	O
choose	O
between	O
1	O
,	O
2	O
,	O
or	O
3	O
supplemental	O
low-level	O
scans	O
with	O
MESO-SAILS	B-Algorithm
active	O
.	O
</s>
<s>
A	O
study	O
published	O
in	O
2016	O
looked	O
at	O
how	O
the	O
MESO-SAILS	B-Algorithm
radar	O
scanning	O
regime	O
performed	O
with	O
respect	O
to	O
tornado	B-Language
debris	O
signature	O
(	O
TDS	O
)	O
detection	O
during	O
the	O
2016	O
tornado	B-Language
season	O
in	O
the	O
Iowa	O
Region	O
,	O
compared	O
to	O
the	O
distribution	O
before	O
its	O
implementation	O
.	O
</s>
<s>
When	O
tornado	B-Language
watches	O
were	O
active	O
,	O
MESO-SAILS	B-Algorithm
was	O
active	O
100%	O
reflecting	O
the	O
National	O
Weather	O
Service	O
expectations	O
for	O
such	O
situations	O
.	O
</s>
<s>
Overall	O
,	O
it	O
was	O
found	O
that	O
the	O
use	O
of	O
MESO-SAILS	B-Algorithm
led	O
to	O
an	O
enhancement	O
in	O
detection	O
and	O
possibly	O
an	O
increased	O
effective	O
range	O
at	O
which	O
TDSs	O
could	O
be	O
detected	O
.	O
</s>
<s>
The	O
use	O
of	O
MESO-SAILS	B-Algorithm
dropped	O
to	O
41%	O
during	O
severe	O
thunderstorms	O
watches	O
however	O
,	O
which	O
may	O
suggest	O
some	O
benefit	O
in	O
keeping	O
MESO-SAILS	B-Algorithm
active	O
during	O
severe	O
thunderstorm	O
watches	O
as	O
well	O
.	O
</s>
